<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            width: 100px;
            height: 100px;
            border-radius: 50%;
            background-color:red;
            margin: 100px auto;
            animation:dong 5s linear infinite;
        }
       
        
        @keyframes dong {
            0% {
                transform: translateX(0);
            }
            25% {
                transform: translateX(500px);
            }
            50%{
                
                transform:translate(500px,500px);
            }
            75%{
                transform:translateY(500px);
            }
           
           
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>